My Windows XP Pro broadband connection (Comcast) was working fine until this morning. I found my PC with a black screen and had to re-boot it. Since then I cannot connect to the internet.
The router and modem are working fine as my laptop connects wirelessly, but connecting the modem directly to my PC via either ethernet or USB ports still doesn't work.
IP Config shows an IP of 169.254.129.204 which I know enough to know isn't right. IP Config /renew yields the error message: "unable to contact DHCP server". I've tried entering a manual IP address but that doesn't work. I've also tried a system restore to Saturday morning and switching off Norton and Windows firewalls - to no avail. The network icon in the system tray shows a connection at 100 mbs on my ethernet card, as does the network connections dialogue box.
I'm now out of ideas. All help gratefully received.